Note: New and reconditioned cylinder heads are available from the manufacturer, and from engine overhaul specialists. Be aware that some specialist tools are required for the dismantling and inspection procedures, and new components may not be readily available. It may therefore be more practical and economical for the home mechanic to purchase a reconditioned head, rather than to dismantle, inspect and recondition the original head.
1. Remove the cylinder head as described in Part A or B of this Chapter (as applicable).
2. If not already done, remove the inlet and exhaust manifolds with reference to the relevant Part of Chapter 4.
3. Remove the camshaft (and followers on diesel engines and 16-valve petrol engines) as described in Part A or B of this Chapter.
4. Using a valve spring compressor, compress each valve spring in turn until the split collets can be removed. Release the compressor, and lift off the spring retainer, spring and spring seat (see illustration).
6.4. Using a valve spring compressor to compress the valve spring
5. Using a pair of pliers, carefully extract the valve stem seal from the top of the guide (see illustration).
6.5. Remove the valve stem oil seal using a pair of pliers
6. Withdraw the valve through the combustion chamber.
7. It is essential that each valve is stored together with its collets, retainer, spring, and spring seat (see illustration). The valves should also be kept in their correct sequence, unless they are so badly worn that they are to be renewed. If they are going to be kept and used again, place each valve assembly in a labelled polythene bag or similar small container. Note that No 1 valve is nearest to the transmission (flywheel) end of the engine.
6.7. Place each valve and its associated components in a labelled polythene bag